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Dissolved carbon dioxide concentration controls baseline stable carbon isotope signatures of a lake food web

Research output: Contribution to journalJournal article

<mark>Journal publication date</mark>09/2012
<mark>Journal</mark>Limnology and Oceanography
Issue number5
Number of pages11
Pages (from-to)1292-1302
Publication statusPublished
Early online date23/07/12
Original languageEnglish


Temporal variation in the baseline stable carbon isotope (δ13C) value of a well-studied, productive lake was examined over a 26-yr period using archived samples of the herbivorous zooplankter Daphnia galeata as a proxy because of its phytoplankton diet. The baseline δ13C value was strongly correlated with pH and the concentration of dissolved carbon dioxide in the lake as well as with the δ13C value of a predatory zooplankter. An isotopic fractionation model incorporating algal physiology (the growth rate, surface area, and carbon content of the main phytoplankton species) and the dissolved carbon dioxide concentration in the lake was used to predict, successfully, the baseline δ13C values of the lake over the study period. In aquatic ecosystems where the concentration of dissolved carbon dioxide is temporally variable, the baseline δ13C value can be more clearly defined by taking the concentration of CO2 into account. This approach will allow food web relationships to be quantified more accurately.